X9271 Datasheet, PDF (2/23 Pages) Xicor Inc. – Single Digitally-Controlled (XDCP) Potentiometer

X9271
DETAILED FUNCTIONAL DIAGRAM
V_CC
HOLD
CS
SCK
SO
SI
A0
A1
WP
INTERFACE
AND
CONTROL
CIRCUITRY
DATA
Bank 0 Power On Recall
50KΩ and 100KΩ
256-taps
R₀ R_{1 WIPER}
R_H
COUNTER
REGISTER
R₂ R₃ ^(WCR)
R_L
R_W
Bank 1 Bank 2
R₀ R₁ R₀ R₁
Bank 3
R₀ R₁
Control
R₂ R₃ R₂ R₃ R₂ R₃
12 additional nonvolatile registers
3 Banks of 4 registers x 8-bits
V_SS
CIRCUIT LEVEL APPLICATIONS
• Vary the gain of a voltage amplifier
• Provide programmable dc reference voltages for
comparators and detectors
• Control the volume in audio circuits
• Trim out the offset voltage error in a voltage amplifier
circuit
• Set the output voltage of a voltage regulator
• Trim the resistance in Wheatstone bridge circuits
• Control the gain, characteristic frequency and
Q-factor in filter circuits
• Set the scale factor and zero point in sensor signal
conditioning circuits
• Vary the frequency and duty cycle of timer ICs
• Vary the dc biasing of a pin diode attenuator in RF
circuits
• Provide a control variable (I, V, or R) in feedback
circuits
SYSTEM LEVEL APPLICATIONS
• Adjust the contrast in LCD displays
• Control the power level of LED transmitters in
communication systems
• Set and regulate the DC biasing point in an RF
power amplifier in wireless systems
• Control the gain in audio and home entertainment
systems
• Provide the variable DC bias for tuners in RF
wireless systems
• Set the operating points in temperature control
systems
• Control the operating point for sensors in industrial
systems
• Trim offset and gain errors in artificial intelligent
systems
REV 1.1.7 2/6/03
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Characteristics subject to change without notice. 2 of 23